Process of producing erythrene.



of erythrene.

UNITED s ATEs PATENT OFFICE.

FRITZ HOFMANN, CARL COUTELLE, AND LUIJWIG TANK, OF ELBERFELD, GERMANY,ASSIGNORS TO 'FARBENFABRIKEN VORM. FRIEDR. BAYER & 00., OF ELBERFELD,GERMANY, A CORPORATION OF GERMANY,

PROCESS OF PRODUCING ERYTHRENE.

No Drawing.

Specification of Letters Patent.

Patented Jan. 7, 1913.

To all whom it may concern:

Be it known that we, FRITZ HOFMANN, CARL CoU'rELLa, and- LUDWIG TANK,doctors of philosophy, chemists, citizens of the GermanEmpire, residingat Elberfeld, Germany, have invented .newand useful Improvements inProcesses of Producing Erythrene, of which the following is aspecification.

It has been found that the technically very valuable hydrocarbonerythrene; can be obtained in a very simple mannei' by decomposingcyclohexanes by the action of hot contact bodies, such as hot surfacesand by isolating the hydrocarbon from the gaseous mixture thus obtained.The process can be carried out with or without the addition of agentspromoting the decomposition.

In order to illustrate the new process more fully the following exampleis given Clyclohexane is heated in a suitable apps:

ratus in such a way that the vapors pass over a spiral of aluminiumsilicates, which is electrically h'eatedto dark red heat. The unchangedparent material returns into the boiler'while the gases are freed fromliquid hydrocarbons by efficient cooling. In addition to otherhydrocarbons the escaping gases contain very considerable quantities Byphysical or chemical methods the erythrene can be isolated from thismixture- Instead of thecyclohexane described in the example homologuesand derivatives of "the cyclohexane, such as 'methylcyclohexanes,dimethylcyclohexanes or other a1kylor arylcyclohexanes,alkoxycyclohexanes or halogencyclohexanes can be used as well as-mixtures of these bodies. In the'same way instead of the aluminiumsilicates other com platinum, quartz, carbon, etc., can be used foreffecting the decomposition. Furthermore the-heating may beefiected byother than the electrical means. The'temperature, can vary Within ratherwide limits. We claim A 1. The process of producing an erythrenehydrocarbon which comprises decom. cyclohexanes by'hotcontaet bodies.

unds capable of being heated, such as.

2. The process of producing erythrene which comprises decomposingcyclohexanes by hot contact bodies.

3. The process of producing erythrene which comprises decomposingcyclohexanes by hot contact bodies, and in isolating erythrene from theresulting gaseous products of decomposition, substantially as described.

gt. The process of producing erythrene which comprises decomposingcyclohexanes by hot contact bodies, continuously mparating the gaseousproducts of decomposition from the undecomposed starting material, andisolating the erythrene from such gaseous products of decomposition,substantially as described.

5. The process of producing erythrene which comprises distillingcyclohexanes and passing the vapors of distillation over hot contactbodies, continuously separating the gaseous products of decomposition,and returning the unchanged starting material and liquid products ofdecomposition to the distilling apparatus, substantially as described.

6. The process of producing an erythrene I decomposition to thedistilling apparatus;

substantially as described.

9,. The process of producing an erythrene hydrocarbon which comprisesdecomposing cyclohexanes by heated aluminium silicate as a contact body.

10. Theprocess .of producing erythrene which'comprises decomcyclohexanes body vbyheated aluminium silicate-as a contact 1, Theprocess of producing erythrene.

Q intone? which comprises distilling cyclohexanes and set our hands inthe presence of two sub- 10 passiig ithe Vapors of distillation bmerscribing witnesses. heate a, uminium silicate as a contact 0 y,continuously separating the gaseous prool- P nets of decomposition, and'returning the LUDG TANK unchanged starting material and liquid productsof decomposition to the distilling Witnesses: apparatus, substantiallyas described. HELEN NUFEB,

in testimony whereof We have hereunto ALBERT NUFER.

